Anti-fatigue mat



FIG. 1 is a perspective view of an anti-fatigue mat showing my new design;

FIG. 2 is a top plan view thereof.

FIG. 3 is a bottom plan view thereof.

FIG. 4 is a front elevational view thereof.

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a left side view thereof.

The broken lines shown in FIG. 3 depict portions of the anti-fatigue mat that form no part of the claimed design. 

CLAIM The ornamental design for an anti-fatigue mat, as shown and described. 